added block() and unblock() support
added block() and unblock() support

kedzie/JGroups,rpelisse/JGroups,slaskawi/JGroups,rhusar/JGroups,deepnarsay/JGroups,slaskawi/JGroups,vjuranek/JGroups,rhusar/JGroups,belaban/JGroups,dimbleby/JGroups,slaskawi/JGroups,pferraro/JGroups,danberindei/JGroups,dimbleby/JGroups,pruivo/JGroups,deepnarsay/JGroups,ligzy/JGroups,ibrahimshbat/JGroups,Sanne/JGroups,ibrahimshbat/JGroups,pferraro/JGroups,ligzy/JGroups,vjuranek/JGroups,kedzie/JGroups,ligzy/JGroups,rpelisse/JGroups,TarantulaTechnology/JGroups,pruivo/JGroups,tristantarrant/JGroups,Sanne/JGroups,pferraro/JGroups,rvansa/JGroups,belaban/JGroups,rhusar/JGroups,TarantulaTechnology/JGroups,pruivo/JGroups,danberindei/JGroups,belaban/JGroups,ibrahimshbat/JGroups,TarantulaTechnology/JGroups,Sanne/JGroups,dimbleby/JGroups,deepnarsay/JGroups,danberindei/JGroups,rpelisse/JGroups,ibrahimshbat/JGroups,rvansa/JGroups,kedzie/JGroups,vjuranek/JGroups,tristantarrant/JGroups